Drill-sharpener



E. L. OLDHAM.

DRILL SHARPENER.

APPLICATION msu mm, 1919.

1,394,214'. Patented 0011.18, 1921.

llllll il.. llllllwli HInl L y l L III'IM .fum MIIIIIIIIH IHI UNITED STATES PATENT OFFICE.

EDWARD L. OLDHA'M, OF DENVER, COLORADO, ASSIGNOR T0 THE DENVER ROCK DRILL MANUFACTURING COMPANY, OF DENVER, COLORADO, A CORPORATION OF DELA- WARE.

DRILL-SHARPENER.

Specification of Letters atent.

Patented Oct. 18, 1921.

To @ZZ whom t may concern:

Be it known that I, EDWARD L. OLDHAM, a citizen of the United States, residin at Denver, in the county of Denver and tate of Colorado, have invented certain new and useful Improvements in Drill-Sharpeners, of which the following is a specification.

The present invention relates more particularly to means for effecting the adjustment of a dolly hammer toward and from the means for clamping the drill steel or other work to be operated on, and the object is to provide simple mechanism by which the dolly can be quickly adjusted and edectively held after such adjustment and at any point desired.

In the accompanying drawings Figure 1 is a view partly in elevation and partly in section of a well known type of drill Sharpener, includingl the improved dolly adjusting means.

Fig. 2 is a longitudinal sectional view on an enlarged Scale through a portion of the dolly hammer and the adjusting mechanism.

Figs. 3 and 4 are respectively cross sectional views on the lines 3-3 and 4 4 of Fig. 1.

Fig. 5 is a detailhorizontal sectional view substantially on the line 5 5 of Fig. 2.

In the embodiment disclosed, a suitable supporting base 6 is employed, on which is secured a top 7 and mounted on this top is suitable work clamping means, shown in the form of relatively movable jaws 8, the upper of which is operated by a motor designated generally 9. The jaws provide between them a seat or socket 10 for the reception of the drill steel or other work to be held thereby during the dollying operation.

The top 7 has a bracket 11 that projects laterally beyond the base 6 and is provided with a guideway 12 in which is slidably mounted a fluid operated dolly hammer 13 carrying a dolly 14 adapted to operate on the work clamped between the jaws 8, as will be readily understood by those skilled in the art. The hammer 13 is retained in the guideway by overhanging plates or bars 15 adapted to engage the base of the hammer as shown in Fig. 4 and frictionally hold the same when tightened down by screw bolts 16. These screw bolts, as shown more particularly in Fig. 4, pass vertically through the sides of the bracket 11, and are threaded into the said bars 15.

The outer ends of the bars 15 project beyond the bracket, and as illustrated in Fig. 3, are connected by a transverse head 17 bolted thereto, as shown at 18, and in cluding a central contractile clamp 19 in the form of a split sleeve. The ends of said sleeve are connected by a contracting bolt 2() journaled in one and threaded into the other, this bolt having an actuating handle 21 pivoted thereto. Journaled in the clamping sleeve 19 is a nut 22 having a head 23 at its inner end that is located at one side of the sleeve, the other end of Said nut on the opposite side of the sleeve 19 having a handle crank 24 liXed thereto. The dolly hammer 13 is provided with a depending lug 25 engaging in the terminal eye 26 of a screw shank 27 having an adjustable threaded engagement in the nut 22.

With this construction, it will be clear that when the bolts 16 and 18 are loosened and the handle crank is rotated, the nut 22 will be turned and the dolly with its hammer can be adjusted toward or from the work placed between the jaws 8. When properly adjusted, it is only necessary to tighten the clamp 19 and the bolts 16, whereupon the hammer will be effectively secured against accidental movement.

From the foregoing, it is thought that the construction, operation and, many advantages of the herein described invention will be apparent to those skilled in the art without further description, and it will be understood that various changes in the size, shape, proportion and minor details of construction may be resorted to within the scope of the claims, without departing from the spirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In apparatus of the character set forth, the combination with a base, of work clamping means mounted thereon, a device for operating on the work, mounted on the base and adjustable thereon toward and from the clamping means, a iiXed support extending outwardly from the base beyond the outer end of said device, an actuating element rotatably mounted on the outer end of the support and held against longitudinal movement along the support, and an actuated element fixed to and movable with the said Work operating device, said actuated element being engaged With and moved by the ac tuating element.

2. In apparatus of the character set forth, the combination with a base, of Work clamping means mounted thereon, a dolly hammer mounted on the base; and adjustable thereon toward and from the clamping means, a fixed support extending outwardly from the base beyond the outer end of said dolly hammer, a handled actuating nut rotatably mounted on the outer end of the support and held against longitudinal movement along the support, and a shank fixed to the dolly hammer and having a threaded engagement With the nut v In apparatus of the character set forth, the combination With a base, of Work clamping means mounted thereon, a dolly hammer slidable on the base and having its underside Spaced therefrom and provided onits underside with a fastening element, a threaded shank detachably engaged with the fastening element and projectingV beyond the rear end of the hammer, an extension on the base, and an operating nut journaled on the extension and engaged with the threads of the shank in rear of the hammer.

4. In apparatus of the character set forth, the combination With a support having a guideway, of Work clamping means at the inner end of the guideway, a dolly hammer slidably mounted in the gudeWay, spaced retaining bars for the hammer overhanging the guidevvay and hammer and rprojecting beyond the rear end of the'latter, an operating device rotatably supported on the projecting portions of the retaining bars,

and a device connected to the hammer and adjustably engaged with the operating de! vlce.

5. In apparatus of the character set forth, the combination With a supporting base, of a top carried thereby and having a laterally extending bracket, Work-y clamping means mounted on the top, V a guideway formed on the bracket and including spaced bars projecting beyond said bracket, a fiu'id operated. dolly hammer slidable in the guide- Way, a bearing member connecting vthe outer ends'of the bars and including a contractile clamp, a nut rotatable in the clamp and having internal threads, a handle crank for turning the nut, and a screw shank connected to the hammer and' havingan adjustable threaded engagement in the nut.

6. In apparatus of the characteriset forth,V the combination with a supporting base, of Work-clamping'mechanism mounted on the base, a fluid-operated dollyhammer mount-V edfon the base to move toward and from the Work-clamping mechanism', means for retaining thehammer on the'base including spaced elements projecting beyond the base, a connection betvveen the" projecting free ends ofvsaidY elements, anv actuating nut j our-V naled on vthe connection, and a sha-nk conf nected to the hammer and having a threaded engagement With the'nut.' c

In testimony'whereof, I aiix my signature in the presence of two Witnesses.

EDWARD OLDHAM.

Witnesses:

SULLIVAN J. THORNE, M. S.v DAVIDSON.' 

